Sewing-machine shuttle



(No Model.)

M. H. MGINTRE 8u S. B. BARTHOLOMEW.

SEWING MAGHNB SHUTTLE.

' Patented 0013.17, 1882.

@entre STATES .maar rtree.

MILVERN H. MCINTIRE AND SAMUEL B. BARTHOLOMEW, OF SPRINGFIELD,MASSACHUSETTS.

SEWING-MACHINESHUTTLE.

SPECIFICATION forming part of Letters Patent No. 266,041, dated October17,1882.

Application filed March 2l, 1882.

To all whom it may concern:

Be itknown that we, MILVERN H. MOIN- Tian and SAMUEL B. BAR'LHOLOMEW,citizens ot' the United States, residing at Spring- 5 held, in thecounty ot' Hampden and State of lvlassachusetts, have jointly inventednew and useful Improvements in Thread Guards for Tensions ofSewing-llIachine Shuttles, ot' which the following is a specitication.

io. Uur invention relates toan improved threadgnard torthe tensions ofsewing machine shutties, and is fully illustrated in the accompanyingdrawings, in which- Figure I is a plan view of a shuttle in partialsection on dotted linesg/ t/of Fig. IV. Fig. II is a plan view inpartial section on line .fr a" ot' Fig. IV. Fig. III is the same as Fig.II in side elevation. Fig. IV is a side elevation ot' a shuttle havingour improvement, and Fig. V

2o is an enlarged detail view.

This invention consists essentially of a latch secured to thetension-spring to either swing or slide thereon and close thethread-passage to the eye or pulley therein, and formed to lock itselfinposition against any butmanual movenient, to present an outer edge incontinuation ofthe straight edges ofthe outside ofthe shuttle andtension-spring and upon which theA thread cannotcatch, and to permit anupward 3c delection at the mouth ot' the thread-passage to catch thethread only in threading, so as to form ot' the shuttle when the latchis opened a complete sel t'threader.

The latch I), secured at one end to the tension-spring L by theserewdthrough the elongated opening t in the latch, is swung or slidinto the position shown in Fig. I to close the passage W, leading to theeye to, and entirely inclose the thread o to prevent the possibility 4oot' its escape from its eye. When-in this position the latch D is heldin place by a slight projection or cam, b, upon its Linder surface,which is received into the passage Wand held there by the wall of thepassage over which it 1s moved. The projection b, when so received inthe thread-passage W, forms a spring-catch to retain the latch D inplace, the spring being supplied by the latchitselt', by the portion ofthe spring L over which it is moved, or by 5o both. The latch D is alsoprovided with the tlangef, which, when the latch is closed, as in Fig.I, forms a continuation of the edge of the spring L over the mouth andedges of the thread -passage WV, and, having the angle of (No model.)

its edge slightly beveled, as shown, presents a surface upon which thethread cannot catch, and over which it may travel without being out. InFig. V an enlarged view of the latch D is shown in reverse.

By the-combination, with the threadpas- 6o sage W, of the latch D soconstructed and operated, we are able to form the mouth of the passage Wof a V shape vertically, as well as horizontally, by flaring the cornerm from the inner face o t' the shuttle, as shown in profile 65 in Fig.III, by means ot' which configuration the corner m, when uncovered bythe latch, as shown in Figs. II and III, forms an easy guide for thethread to its eye w. This form of mouth, which would be impossible butfor the 7o covering-latch D, may supply the spring to retain the latchclosed against being swung open by means ot' its part b, or, as bel'orestated, may only supply an edge against which the spring' ot` the latchcreates sufticient friction to 75 prevent its movement..

Although the latch, when closed, cannot be moved by any action oftheshuttle or thread, it may readily be moved by the fingers when thethread is to be put in tension. Now, having described our invention,what we claim is l. In a sewing-machine,shuttle, the combination, withthe tension-spring having the threadpassage IV, of the spring-latch D,secured thereupon and adapted to be moved upon the spring to catch insaid passage to close it, and so entirely inclose the thread.

2. In a sewing-machine shuttle, the combination, with the tension-springhaving the 9o thread-passage WV, ofthe spring-latch D, provided with thelangef and cam b and adapted to be moved upon the tension-spring tocatch in the passage W to inclose the thread and form a smooth surfaceoverV the mouth of said passage.

8. In a scwingmachine shuttle, the combination, with the tension-springL, having the passage W, and with the latch D, secured thereon andadapted to move thereupon to close roo the mouth of said thread-passage,ot' the vertically-aring surface m, arranged to operate as and for thepurpose set forth.

MILVERN H. MOINTIRE. SAMUEL B. BARTHOLOMEW.

Witnesses I-I. A. CHAPIN, It. F. HYDE.

